Why will The pressure of air in a tyre remain the same whether it is supporting the weight of the vehicle or not?
by 
Daniel
ANSWERS: 1
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Why indeed? I think the pressure will go up, if the tyres are bearing the load of the car. Let's say the car is a ton (1000kg), and for the sake of simplicity, the supporting area is 400 cm^2 (tyre 20cm wide, x 4 x 5cm strip touching the road), so it is a load of 2.5kg per sqcm, which is 2.5 atm. That is roughly the right order of magnitude. This is the pressure you need to support the car (obviously, because the tyre will collapse if you get a ..hehe.. flat tyre). That the pressure does not go down much if you lift the car: the tyres are not as floppy as a balloon, the volume will only increase a bit (basically the tyre will become fully round, instead of being sqeezed at the point of contact). So the pressure will drop only a bit, but it will! Otherwise the tyre would be very stiff, and would not dampen the shocks, as it does and should.
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